Open Source.

The libraries we build on. Last updated 9 May 2026.

Speakeasy stands on a lot of free software. This page lists the direct dependencies that ship in the app or run on our server, along with their licenses. Indirect (transitive) dependencies are tracked in our package lockfiles in the project repository.

Cryptography

libsignal

AGPL-3.0

Signal Protocol implementation. End-to-end message encryption + sender keys for groups.

libsodium

ISC

Modern, audited primitives — used for HKDF, HMAC, and the channel-key envelope construction.

Mobile runtime

React Native

MIT

Cross-platform UI runtime. The whole app surface is RN.

Hermes

MIT

JavaScript engine for React Native. Optimized for mobile cold-start.

React Navigation

MIT

Stack navigator + screen lifecycle.

Zustand

MIT

State management for the persisted local stores.

react-native-svg

MIT

SVG rendering — every animated avatar in the app uses it.

async-storage

MIT

Persistence layer for settings, conversation cache, identity.

Voice calls

WebRTC

BSD-3-Clause

Peer-to-peer audio transport. End-to-end encrypted.

react-native-callkeep

ISC

CallKit / ConnectionService bridge so calls feel native.

Server

Fastify

MIT

HTTP + WebSocket framework for the message-relay server.

Drizzle ORM

Apache-2.0

SQL query layer for Postgres.

node-postgres

MIT

Postgres driver.

ioredis

MIT

Redis client — presence + cross-instance ack routing.

Type

Bricolage Grotesque

SIL OFL 1.1

The wordmark, every label, every preview line. Designed by Mathieu Triay.

Proprietary services

A few non-open dependencies — declared here for completeness:

Vouchflow

PROPRIETARY

Device attestation. Used to keep bots out without learning who you are. See privacy.

Cloudflare Calls (TURN)

PROPRIETARY

TURN relay for voice calls when direct peer-to-peer isn't possible.

Fly.io

PROPRIETARY

Application + Postgres + Redis hosting.

Source

Speakeasy's own source is open. The full monorepo — application server, mobile client, crypto packages, marketing site, and infra config — lives at github.com/speakeasy-messenger/speakeasy. File a bug, send a PR, or just read the code.

For libraries listed above whose license requires us to publish derivative source (notably libsignal under AGPL-3.0): our integration is unmodified — we use the upstream binary release. Source is at the linked repository.